2 * Amlogic SD/eMMC driver for the GX/S905 family SoCs
4 * Copyright (c) 2016 BayLibre, SAS.
5 * Author: Kevin Hilman <khilman@baylibre.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 * The full GNU General Public License is included in this distribution
19 * in the file called COPYING.
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/device.h>
25 #include <linux/of_device.h>
26 #include <linux/platform_device.h>
27 #include <linux/ioport.h>
28 #include <linux/spinlock.h>
29 #include <linux/dma-mapping.h>
30 #include <linux/mmc/host.h>
31 #include <linux/mmc/mmc.h>
32 #include <linux/mmc/sdio.h>
33 #include <linux/mmc/slot-gpio.h>
35 #include <linux/clk.h>
36 #include <linux/clk-provider.h>
37 #include <linux/regulator/consumer.h>
38 #include <linux/interrupt.h>
40 #define DRIVER_NAME "meson-gx-mmc"
42 #define SD_EMMC_CLOCK 0x0
43 #define CLK_DIV_SHIFT 0
44 #define CLK_DIV_WIDTH 6
45 #define CLK_DIV_MASK 0x3f
46 #define CLK_DIV_MAX 63
47 #define CLK_SRC_SHIFT 6
48 #define CLK_SRC_WIDTH 2
49 #define CLK_SRC_MASK 0x3
50 #define CLK_SRC_XTAL 0 /* external crystal */
51 #define CLK_SRC_XTAL_RATE 24000000
52 #define CLK_SRC_PLL 1 /* FCLK_DIV2 */
53 #define CLK_SRC_PLL_RATE 1000000000
54 #define CLK_PHASE_SHIFT 8
55 #define CLK_PHASE_MASK 0x3
57 #define CLK_PHASE_90 1
58 #define CLK_PHASE_180 2
59 #define CLK_PHASE_270 3
60 #define CLK_ALWAYS_ON BIT(24)
62 #define SD_EMMC_DElAY 0x4
63 #define SD_EMMC_ADJUST 0x8
64 #define SD_EMMC_CALOUT 0x10
65 #define SD_EMMC_START 0x40
66 #define START_DESC_INIT BIT(0)
67 #define START_DESC_BUSY BIT(1)
68 #define START_DESC_ADDR_SHIFT 2
69 #define START_DESC_ADDR_MASK (~0x3)
71 #define SD_EMMC_CFG 0x44
72 #define CFG_BUS_WIDTH_SHIFT 0
73 #define CFG_BUS_WIDTH_MASK 0x3
74 #define CFG_BUS_WIDTH_1 0x0
75 #define CFG_BUS_WIDTH_4 0x1
76 #define CFG_BUS_WIDTH_8 0x2
77 #define CFG_DDR BIT(2)
78 #define CFG_BLK_LEN_SHIFT 4
79 #define CFG_BLK_LEN_MASK 0xf
80 #define CFG_RESP_TIMEOUT_SHIFT 8
81 #define CFG_RESP_TIMEOUT_MASK 0xf
82 #define CFG_RC_CC_SHIFT 12
83 #define CFG_RC_CC_MASK 0xf
84 #define CFG_STOP_CLOCK BIT(22)
85 #define CFG_CLK_ALWAYS_ON BIT(18)
86 #define CFG_CHK_DS BIT(20)
87 #define CFG_AUTO_CLK BIT(23)
89 #define SD_EMMC_STATUS 0x48
90 #define STATUS_BUSY BIT(31)
92 #define SD_EMMC_IRQ_EN 0x4c
93 #define IRQ_EN_MASK 0x3fff
94 #define IRQ_RXD_ERR_SHIFT 0
95 #define IRQ_RXD_ERR_MASK 0xff
96 #define IRQ_TXD_ERR BIT(8)
97 #define IRQ_DESC_ERR BIT(9)
98 #define IRQ_RESP_ERR BIT(10)
99 #define IRQ_RESP_TIMEOUT BIT(11)
100 #define IRQ_DESC_TIMEOUT BIT(12)
101 #define IRQ_END_OF_CHAIN BIT(13)
102 #define IRQ_RESP_STATUS BIT(14)
103 #define IRQ_SDIO BIT(15)
105 #define SD_EMMC_CMD_CFG 0x50
106 #define SD_EMMC_CMD_ARG 0x54
107 #define SD_EMMC_CMD_DAT 0x58
108 #define SD_EMMC_CMD_RSP 0x5c
109 #define SD_EMMC_CMD_RSP1 0x60
110 #define SD_EMMC_CMD_RSP2 0x64
111 #define SD_EMMC_CMD_RSP3 0x68
113 #define SD_EMMC_RXD 0x94
114 #define SD_EMMC_TXD 0x94
115 #define SD_EMMC_LAST_REG SD_EMMC_TXD
117 #define SD_EMMC_CFG_BLK_SIZE 512 /* internal buffer max: 512 bytes */
118 #define SD_EMMC_CFG_RESP_TIMEOUT 256 /* in clock cycles */
119 #define SD_EMMC_CFG_CMD_GAP 16 /* in clock cycles */
120 #define MUX_CLK_NUM_PARENTS 2
124 struct mmc_host *mmc;
125 struct mmc_request *mrq;
126 struct mmc_command *cmd;
132 struct clk *core_clk;
135 struct clk *mux_parent[MUX_CLK_NUM_PARENTS];
136 unsigned long current_clock;
138 struct clk_divider cfg_div;
139 struct clk *cfg_div_clk;
141 unsigned int bounce_buf_size;
143 dma_addr_t bounce_dma_addr;
148 struct sd_emmc_desc {
154 #define CMD_CFG_LENGTH_SHIFT 0
155 #define CMD_CFG_LENGTH_MASK 0x1ff
156 #define CMD_CFG_BLOCK_MODE BIT(9)
157 #define CMD_CFG_R1B BIT(10)
158 #define CMD_CFG_END_OF_CHAIN BIT(11)
159 #define CMD_CFG_TIMEOUT_SHIFT 12
160 #define CMD_CFG_TIMEOUT_MASK 0xf
161 #define CMD_CFG_NO_RESP BIT(16)
162 #define CMD_CFG_NO_CMD BIT(17)
163 #define CMD_CFG_DATA_IO BIT(18)
164 #define CMD_CFG_DATA_WR BIT(19)
165 #define CMD_CFG_RESP_NOCRC BIT(20)
166 #define CMD_CFG_RESP_128 BIT(21)
167 #define CMD_CFG_RESP_NUM BIT(22)
168 #define CMD_CFG_DATA_NUM BIT(23)
169 #define CMD_CFG_CMD_INDEX_SHIFT 24
170 #define CMD_CFG_CMD_INDEX_MASK 0x3f
171 #define CMD_CFG_ERROR BIT(30)
172 #define CMD_CFG_OWNER BIT(31)
174 #define CMD_DATA_MASK (~0x3)
175 #define CMD_DATA_BIG_ENDIAN BIT(1)
176 #define CMD_DATA_SRAM BIT(0)
177 #define CMD_RESP_MASK (~0x1)
178 #define CMD_RESP_SRAM BIT(0)
180 static int meson_mmc_clk_set(struct meson_host *host, unsigned long clk_rate)
182 struct mmc_host *mmc = host->mmc;
187 if (WARN_ON(clk_rate > mmc->f_max))
188 clk_rate = mmc->f_max;
189 else if (WARN_ON(clk_rate < mmc->f_min))
190 clk_rate = mmc->f_min;
193 if (clk_rate == host->current_clock)
197 cfg = readl(host->regs + SD_EMMC_CFG);
198 if (!(cfg & CFG_STOP_CLOCK)) {
199 cfg |= CFG_STOP_CLOCK;
200 writel(cfg, host->regs + SD_EMMC_CFG);
203 dev_dbg(host->dev, "change clock rate %u -> %lu\n",
204 mmc->actual_clock, clk_rate);
207 mmc->actual_clock = 0;
208 host->current_clock = 0;
209 /* return with clock being stopped */
213 ret = clk_set_rate(host->cfg_div_clk, clk_rate);
215 dev_err(host->dev, "Unable to set cfg_div_clk to %lu. ret=%d\n",
220 mmc->actual_clock = clk_get_rate(host->cfg_div_clk);
221 host->current_clock = clk_rate;
223 if (clk_rate != mmc->actual_clock)
225 "divider requested rate %lu != actual rate %u\n",
226 clk_rate, mmc->actual_clock);
228 /* (re)start clock */
229 cfg = readl(host->regs + SD_EMMC_CFG);
230 cfg &= ~CFG_STOP_CLOCK;
231 writel(cfg, host->regs + SD_EMMC_CFG);
237 * The SD/eMMC IP block has an internal mux and divider used for
238 * generating the MMC clock. Use the clock framework to create and
239 * manage these clocks.
241 static int meson_mmc_clk_init(struct meson_host *host)
243 struct clk_init_data init;
246 const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
247 unsigned int mux_parent_count = 0;
248 const char *clk_div_parents[1];
251 /* get the mux parents */
252 for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
255 snprintf(name, sizeof(name), "clkin%d", i);
256 host->mux_parent[i] = devm_clk_get(host->dev, name);
257 if (IS_ERR(host->mux_parent[i])) {
258 ret = PTR_ERR(host->mux_parent[i]);
259 if (PTR_ERR(host->mux_parent[i]) != -EPROBE_DEFER)
260 dev_err(host->dev, "Missing clock %s\n", name);
261 host->mux_parent[i] = NULL;
265 mux_parent_names[i] = __clk_get_name(host->mux_parent[i]);
270 snprintf(clk_name, sizeof(clk_name), "%s#mux", dev_name(host->dev));
271 init.name = clk_name;
272 init.ops = &clk_mux_ops;
274 init.parent_names = mux_parent_names;
275 init.num_parents = mux_parent_count;
277 host->mux.reg = host->regs + SD_EMMC_CLOCK;
278 host->mux.shift = CLK_SRC_SHIFT;
279 host->mux.mask = CLK_SRC_MASK;
281 host->mux.table = NULL;
282 host->mux.hw.init = &init;
284 host->mux_clk = devm_clk_register(host->dev, &host->mux.hw);
285 if (WARN_ON(IS_ERR(host->mux_clk)))
286 return PTR_ERR(host->mux_clk);
288 /* create the divider */
289 snprintf(clk_name, sizeof(clk_name), "%s#div", dev_name(host->dev));
290 init.name = devm_kstrdup(host->dev, clk_name, GFP_KERNEL);
291 init.ops = &clk_divider_ops;
292 init.flags = CLK_SET_RATE_PARENT;
293 clk_div_parents[0] = __clk_get_name(host->mux_clk);
294 init.parent_names = clk_div_parents;
295 init.num_parents = ARRAY_SIZE(clk_div_parents);
297 host->cfg_div.reg = host->regs + SD_EMMC_CLOCK;
298 host->cfg_div.shift = CLK_DIV_SHIFT;
299 host->cfg_div.width = CLK_DIV_WIDTH;
300 host->cfg_div.hw.init = &init;
301 host->cfg_div.flags = CLK_DIVIDER_ONE_BASED |
302 CLK_DIVIDER_ROUND_CLOSEST | CLK_DIVIDER_ALLOW_ZERO;
304 host->cfg_div_clk = devm_clk_register(host->dev, &host->cfg_div.hw);
305 if (WARN_ON(PTR_ERR_OR_ZERO(host->cfg_div_clk)))
306 return PTR_ERR(host->cfg_div_clk);
308 /* init SD_EMMC_CLOCK to sane defaults w/min clock rate */
310 clk_reg |= CLK_PHASE_180 << CLK_PHASE_SHIFT;
311 clk_reg |= CLK_SRC_XTAL << CLK_SRC_SHIFT;
312 clk_reg |= CLK_DIV_MAX << CLK_DIV_SHIFT;
313 clk_reg &= ~CLK_ALWAYS_ON;
314 writel(clk_reg, host->regs + SD_EMMC_CLOCK);
316 /* Ensure clock starts in "auto" mode, not "always on" */
317 cfg = readl(host->regs + SD_EMMC_CFG);
318 cfg &= ~CFG_CLK_ALWAYS_ON;
320 writel(cfg, host->regs + SD_EMMC_CFG);
322 ret = clk_prepare_enable(host->cfg_div_clk);
326 /* Get the nearest minimum clock to 400KHz */
327 host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
329 ret = meson_mmc_clk_set(host, host->mmc->f_min);
331 clk_disable_unprepare(host->cfg_div_clk);
336 static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
338 struct meson_host *host = mmc_priv(mmc);
343 * GPIO regulator, only controls switching between 1v8 and
344 * 3v3, doesn't support MMC_POWER_OFF, MMC_POWER_ON.
346 switch (ios->power_mode) {
348 if (!IS_ERR(mmc->supply.vmmc))
349 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
351 if (!IS_ERR(mmc->supply.vqmmc) && host->vqmmc_enabled) {
352 regulator_disable(mmc->supply.vqmmc);
353 host->vqmmc_enabled = false;
359 if (!IS_ERR(mmc->supply.vmmc))
360 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
364 if (!IS_ERR(mmc->supply.vqmmc) && !host->vqmmc_enabled) {
365 int ret = regulator_enable(mmc->supply.vqmmc);
368 dev_err(mmc_dev(mmc),
369 "failed to enable vqmmc regulator\n");
371 host->vqmmc_enabled = true;
378 meson_mmc_clk_set(host, ios->clock);
381 switch (ios->bus_width) {
382 case MMC_BUS_WIDTH_1:
383 bus_width = CFG_BUS_WIDTH_1;
385 case MMC_BUS_WIDTH_4:
386 bus_width = CFG_BUS_WIDTH_4;
388 case MMC_BUS_WIDTH_8:
389 bus_width = CFG_BUS_WIDTH_8;
392 dev_err(host->dev, "Invalid ios->bus_width: %u. Setting to 4.\n",
394 bus_width = CFG_BUS_WIDTH_4;
397 val = readl(host->regs + SD_EMMC_CFG);
400 val &= ~(CFG_BUS_WIDTH_MASK << CFG_BUS_WIDTH_SHIFT);
401 val |= bus_width << CFG_BUS_WIDTH_SHIFT;
403 val &= ~(CFG_BLK_LEN_MASK << CFG_BLK_LEN_SHIFT);
404 val |= ilog2(SD_EMMC_CFG_BLK_SIZE) << CFG_BLK_LEN_SHIFT;
406 val &= ~(CFG_RESP_TIMEOUT_MASK << CFG_RESP_TIMEOUT_SHIFT);
407 val |= ilog2(SD_EMMC_CFG_RESP_TIMEOUT) << CFG_RESP_TIMEOUT_SHIFT;
409 val &= ~(CFG_RC_CC_MASK << CFG_RC_CC_SHIFT);
410 val |= ilog2(SD_EMMC_CFG_CMD_GAP) << CFG_RC_CC_SHIFT;
413 if (ios->timing == MMC_TIMING_UHS_DDR50 ||
414 ios->timing == MMC_TIMING_MMC_DDR52 ||
415 ios->timing == MMC_TIMING_MMC_HS400)
419 if (ios->timing == MMC_TIMING_MMC_HS400)
422 writel(val, host->regs + SD_EMMC_CFG);
425 dev_dbg(host->dev, "%s: SD_EMMC_CFG: 0x%08x -> 0x%08x\n",
426 __func__, orig, val);
429 static int meson_mmc_request_done(struct mmc_host *mmc, struct mmc_request *mrq)
431 struct meson_host *host = mmc_priv(mmc);
433 WARN_ON(host->mrq != mrq);
437 mmc_request_done(host->mmc, mrq);
442 static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
444 struct meson_host *host = mmc_priv(mmc);
445 struct sd_emmc_desc *desc, desc_tmp;
447 u8 blk_len, cmd_cfg_timeout;
448 unsigned int xfer_bytes = 0;
450 /* Setup descriptors */
453 memset(desc, 0, sizeof(struct sd_emmc_desc));
455 desc->cmd_cfg |= (cmd->opcode & CMD_CFG_CMD_INDEX_MASK) <<
456 CMD_CFG_CMD_INDEX_SHIFT;
457 desc->cmd_cfg |= CMD_CFG_OWNER; /* owned by CPU */
458 desc->cmd_arg = cmd->arg;
461 if (cmd->flags & MMC_RSP_PRESENT) {
462 desc->cmd_cfg &= ~CMD_CFG_NO_RESP;
463 if (cmd->flags & MMC_RSP_136)
464 desc->cmd_cfg |= CMD_CFG_RESP_128;
465 desc->cmd_cfg |= CMD_CFG_RESP_NUM;
468 if (!(cmd->flags & MMC_RSP_CRC))
469 desc->cmd_cfg |= CMD_CFG_RESP_NOCRC;
471 if (cmd->flags & MMC_RSP_BUSY)
472 desc->cmd_cfg |= CMD_CFG_R1B;
474 desc->cmd_cfg |= CMD_CFG_NO_RESP;
479 desc->cmd_cfg |= CMD_CFG_DATA_IO;
480 if (cmd->data->blocks > 1) {
481 desc->cmd_cfg |= CMD_CFG_BLOCK_MODE;
483 (cmd->data->blocks & CMD_CFG_LENGTH_MASK) <<
484 CMD_CFG_LENGTH_SHIFT;
486 /* check if block-size matches, if not update */
487 cfg = readl(host->regs + SD_EMMC_CFG);
488 blk_len = cfg & (CFG_BLK_LEN_MASK << CFG_BLK_LEN_SHIFT);
489 blk_len >>= CFG_BLK_LEN_SHIFT;
490 if (blk_len != ilog2(cmd->data->blksz)) {
491 dev_dbg(host->dev, "%s: update blk_len %d -> %d\n",
493 ilog2(cmd->data->blksz));
494 blk_len = ilog2(cmd->data->blksz);
495 cfg &= ~(CFG_BLK_LEN_MASK << CFG_BLK_LEN_SHIFT);
496 cfg |= blk_len << CFG_BLK_LEN_SHIFT;
497 writel(cfg, host->regs + SD_EMMC_CFG);
500 desc->cmd_cfg &= ~CMD_CFG_BLOCK_MODE;
502 (cmd->data->blksz & CMD_CFG_LENGTH_MASK) <<
503 CMD_CFG_LENGTH_SHIFT;
506 cmd->data->bytes_xfered = 0;
507 xfer_bytes = cmd->data->blksz * cmd->data->blocks;
508 if (cmd->data->flags & MMC_DATA_WRITE) {
509 desc->cmd_cfg |= CMD_CFG_DATA_WR;
510 WARN_ON(xfer_bytes > host->bounce_buf_size);
511 sg_copy_to_buffer(cmd->data->sg, cmd->data->sg_len,
512 host->bounce_buf, xfer_bytes);
513 cmd->data->bytes_xfered = xfer_bytes;
516 desc->cmd_cfg &= ~CMD_CFG_DATA_WR;
519 if (xfer_bytes > 0) {
520 desc->cmd_cfg &= ~CMD_CFG_DATA_NUM;
521 desc->cmd_data = host->bounce_dma_addr & CMD_DATA_MASK;
523 /* write data to data_addr */
524 desc->cmd_cfg |= CMD_CFG_DATA_NUM;
528 cmd_cfg_timeout = 12;
530 desc->cmd_cfg &= ~CMD_CFG_DATA_IO;
531 cmd_cfg_timeout = 10;
533 desc->cmd_cfg |= (cmd_cfg_timeout & CMD_CFG_TIMEOUT_MASK) <<
534 CMD_CFG_TIMEOUT_SHIFT;
538 /* Last descriptor */
539 desc->cmd_cfg |= CMD_CFG_END_OF_CHAIN;
540 writel(desc->cmd_cfg, host->regs + SD_EMMC_CMD_CFG);
541 writel(desc->cmd_data, host->regs + SD_EMMC_CMD_DAT);
542 writel(desc->cmd_resp, host->regs + SD_EMMC_CMD_RSP);
543 wmb(); /* ensure descriptor is written before kicked */
544 writel(desc->cmd_arg, host->regs + SD_EMMC_CMD_ARG);
547 static void meson_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
549 struct meson_host *host = mmc_priv(mmc);
551 WARN_ON(host->mrq != NULL);
554 writel(0, host->regs + SD_EMMC_START);
559 meson_mmc_start_cmd(mmc, mrq->sbc);
561 meson_mmc_start_cmd(mmc, mrq->cmd);
564 static int meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd)
566 struct meson_host *host = mmc_priv(mmc);
568 if (cmd->flags & MMC_RSP_136) {
569 cmd->resp[0] = readl(host->regs + SD_EMMC_CMD_RSP3);
570 cmd->resp[1] = readl(host->regs + SD_EMMC_CMD_RSP2);
571 cmd->resp[2] = readl(host->regs + SD_EMMC_CMD_RSP1);
572 cmd->resp[3] = readl(host->regs + SD_EMMC_CMD_RSP);
573 } else if (cmd->flags & MMC_RSP_PRESENT) {
574 cmd->resp[0] = readl(host->regs + SD_EMMC_CMD_RSP);
580 static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
582 struct meson_host *host = dev_id;
583 struct mmc_request *mrq;
584 struct mmc_command *cmd;
585 u32 irq_en, status, raw_status;
586 irqreturn_t ret = IRQ_HANDLED;
601 spin_lock(&host->lock);
602 irq_en = readl(host->regs + SD_EMMC_IRQ_EN);
603 raw_status = readl(host->regs + SD_EMMC_STATUS);
604 status = raw_status & irq_en;
607 dev_warn(host->dev, "Spurious IRQ! status=0x%08x, irq_en=0x%08x\n",
614 if (status & IRQ_RXD_ERR_MASK) {
615 dev_dbg(host->dev, "Unhandled IRQ: RXD error\n");
616 cmd->error = -EILSEQ;
618 if (status & IRQ_TXD_ERR) {
619 dev_dbg(host->dev, "Unhandled IRQ: TXD error\n");
620 cmd->error = -EILSEQ;
622 if (status & IRQ_DESC_ERR)
623 dev_dbg(host->dev, "Unhandled IRQ: Descriptor error\n");
624 if (status & IRQ_RESP_ERR) {
625 dev_dbg(host->dev, "Unhandled IRQ: Response error\n");
626 cmd->error = -EILSEQ;
628 if (status & IRQ_RESP_TIMEOUT) {
629 dev_dbg(host->dev, "Unhandled IRQ: Response timeout\n");
630 cmd->error = -ETIMEDOUT;
632 if (status & IRQ_DESC_TIMEOUT) {
633 dev_dbg(host->dev, "Unhandled IRQ: Descriptor timeout\n");
634 cmd->error = -ETIMEDOUT;
636 if (status & IRQ_SDIO)
637 dev_dbg(host->dev, "Unhandled IRQ: SDIO.\n");
639 if (status & (IRQ_END_OF_CHAIN | IRQ_RESP_STATUS))
640 ret = IRQ_WAKE_THREAD;
642 dev_warn(host->dev, "Unknown IRQ! status=0x%04x: MMC CMD%u arg=0x%08x flags=0x%08x stop=%d\n",
643 status, cmd->opcode, cmd->arg,
644 cmd->flags, mrq->stop ? 1 : 0);
646 struct mmc_data *data = cmd->data;
648 dev_warn(host->dev, "\tblksz %u blocks %u flags 0x%08x (%s%s)",
649 data->blksz, data->blocks, data->flags,
650 data->flags & MMC_DATA_WRITE ? "write" : "",
651 data->flags & MMC_DATA_READ ? "read" : "");
656 /* ack all (enabled) interrupts */
657 writel(status, host->regs + SD_EMMC_STATUS);
659 if (ret == IRQ_HANDLED) {
660 meson_mmc_read_resp(host->mmc, cmd);
661 meson_mmc_request_done(host->mmc, cmd->mrq);
664 spin_unlock(&host->lock);
668 static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id)
670 struct meson_host *host = dev_id;
671 struct mmc_request *mrq = host->mrq;
672 struct mmc_command *cmd = host->cmd;
673 struct mmc_data *data;
674 unsigned int xfer_bytes;
683 if (data && data->flags & MMC_DATA_READ) {
684 xfer_bytes = data->blksz * data->blocks;
685 WARN_ON(xfer_bytes > host->bounce_buf_size);
686 sg_copy_from_buffer(data->sg, data->sg_len,
687 host->bounce_buf, xfer_bytes);
688 data->bytes_xfered = xfer_bytes;
691 meson_mmc_read_resp(host->mmc, cmd);
692 if (!data || !data->stop || mrq->sbc)
693 meson_mmc_request_done(host->mmc, mrq);
695 meson_mmc_start_cmd(host->mmc, data->stop);
701 * NOTE: we only need this until the GPIO/pinctrl driver can handle
702 * interrupts. For now, the MMC core will use this for polling.
704 static int meson_mmc_get_cd(struct mmc_host *mmc)
706 int status = mmc_gpio_get_cd(mmc);
708 if (status == -ENOSYS)
709 return 1; /* assume present */
714 static const struct mmc_host_ops meson_mmc_ops = {
715 .request = meson_mmc_request,
716 .set_ios = meson_mmc_set_ios,
717 .get_cd = meson_mmc_get_cd,
720 static int meson_mmc_probe(struct platform_device *pdev)
722 struct resource *res;
723 struct meson_host *host;
724 struct mmc_host *mmc;
727 mmc = mmc_alloc_host(sizeof(struct meson_host), &pdev->dev);
730 host = mmc_priv(mmc);
732 host->dev = &pdev->dev;
733 dev_set_drvdata(&pdev->dev, host);
735 spin_lock_init(&host->lock);
737 /* Get regulators and the supported OCR mask */
738 host->vqmmc_enabled = false;
739 ret = mmc_regulator_get_supply(mmc);
740 if (ret == -EPROBE_DEFER)
743 ret = mmc_of_parse(mmc);
745 if (ret != -EPROBE_DEFER)
746 dev_warn(&pdev->dev, "error parsing DT: %d\n", ret);
750 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
751 host->regs = devm_ioremap_resource(&pdev->dev, res);
752 if (IS_ERR(host->regs)) {
753 ret = PTR_ERR(host->regs);
757 host->irq = platform_get_irq(pdev, 0);
758 if (host->irq == 0) {
759 dev_err(&pdev->dev, "failed to get interrupt resource.\n");
764 host->core_clk = devm_clk_get(&pdev->dev, "core");
765 if (IS_ERR(host->core_clk)) {
766 ret = PTR_ERR(host->core_clk);
770 ret = clk_prepare_enable(host->core_clk);
774 ret = meson_mmc_clk_init(host);
779 writel(0, host->regs + SD_EMMC_START);
781 /* clear, ack, enable all interrupts */
782 writel(0, host->regs + SD_EMMC_IRQ_EN);
783 writel(IRQ_EN_MASK, host->regs + SD_EMMC_STATUS);
784 writel(IRQ_EN_MASK, host->regs + SD_EMMC_IRQ_EN);
786 ret = devm_request_threaded_irq(&pdev->dev, host->irq,
787 meson_mmc_irq, meson_mmc_irq_thread,
788 IRQF_SHARED, DRIVER_NAME, host);
792 mmc->max_blk_count = CMD_CFG_LENGTH_MASK;
793 mmc->max_req_size = mmc->max_blk_count * mmc->max_blk_size;
795 /* data bounce buffer */
796 host->bounce_buf_size = mmc->max_req_size;
798 dma_alloc_coherent(host->dev, host->bounce_buf_size,
799 &host->bounce_dma_addr, GFP_KERNEL);
800 if (host->bounce_buf == NULL) {
801 dev_err(host->dev, "Unable to map allocate DMA bounce buffer.\n");
806 mmc->ops = &meson_mmc_ops;
812 clk_disable_unprepare(host->cfg_div_clk);
813 clk_disable_unprepare(host->core_clk);
818 static int meson_mmc_remove(struct platform_device *pdev)
820 struct meson_host *host = dev_get_drvdata(&pdev->dev);
822 /* disable interrupts */
823 writel(0, host->regs + SD_EMMC_IRQ_EN);
825 dma_free_coherent(host->dev, host->bounce_buf_size,
826 host->bounce_buf, host->bounce_dma_addr);
828 clk_disable_unprepare(host->cfg_div_clk);
829 clk_disable_unprepare(host->core_clk);
831 mmc_free_host(host->mmc);
835 static const struct of_device_id meson_mmc_of_match[] = {
836 { .compatible = "amlogic,meson-gx-mmc", },
837 { .compatible = "amlogic,meson-gxbb-mmc", },
838 { .compatible = "amlogic,meson-gxl-mmc", },
839 { .compatible = "amlogic,meson-gxm-mmc", },
842 MODULE_DEVICE_TABLE(of, meson_mmc_of_match);
844 static struct platform_driver meson_mmc_driver = {
845 .probe = meson_mmc_probe,
846 .remove = meson_mmc_remove,
849 .of_match_table = of_match_ptr(meson_mmc_of_match),
853 module_platform_driver(meson_mmc_driver);
855 MODULE_DESCRIPTION("Amlogic S905*/GX* SD/eMMC driver");
856 MODULE_AUTHOR("Kevin Hilman <khilman@baylibre.com>");
857 MODULE_LICENSE("GPL v2");